Electric heating-pad.



H. E. BLOOMER.

y ELECTRIC HEATING PAD.

APPLxcATloN FILED sEPT.8,1914.

UNITED STATES PATENT OFFICE.

HARVEY E.,BLO0MEB,. 0F MILWAUKEE, WISCONSIN, ASSIGNOR T0 P. 8c B. ,MFGL C0., 0F MILWAUKEE, WISCONSIN.

ELECTRIC HEATING-PAD.

Specication of Letters Patent.

Patented June 8, 1915.

Application led September 8, 1914. Serial No: 860,656;

T0 all whom it may concern Be it known that I, HARVEY E. BLooMER, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee andState of Visconsin, have invented certain new and useful Improvements in Electric `Heating-Pads; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention refers to electric heatingpads and has for its object to provide a simple, economical and effective means for securing the resistance conductor to the flexible non-conducting body sheet, which sheet may be of any suitable fabric or analogous material.

The specific object of my invention is to utilize the metallic conductor strand (either jacketed with insulation or bare) as a sewing element in itself, whereby the resistance conductor is in stitched union with the body, the operation being effected either by stitching the conductor with a hand needle or a sewing machine, under which latter conditions the bobbin thread or needle thread may be conductors or one of the threads may be of cotton or analogous material. It is understood that when the conductor thread is fed by a machine in a sewing operation, it may be interlocked with a bottom thread to form any style of stitch or vice versa. By the above arrangement it is apparent that the resistance conductor so attached to the body of the pad will be quickly affixed thereto with a maximum amount of surface or length of conductor in proportion to a minimum space.

Another object of my invention is to provide a jacket for the conductor-carrying body, which jacket is impervious to moisture and is stitched at its edges to the body.

A further object of my invention is to protect the terminal edges of the resistance conductor by lap-folding and securing the corner edges of the pad, whereby strain is .relieved at the point of connecting the feed wires and resistance conductor wires.

With the above and other minor objects in view my invention consists in certain peculiarities of construction and combination of parts as set forth hereinafter with reference to the accompanying drawings and subsequently' claimed.

In the drawings Figure l represents a. face view of a heating-pad embodying the features of my invention with parts broken away and removed to more clearly illustrate the details-'of construction, and Fig. 2, a magnified longitudinal sectional elevation of aportion of the pad showing the arrangement of stitching the conductor wire to the body sheet.

Referring by characters to the drawings, 1 lrepresents a body sheet that 'is made of canvas or other suitable ductile nonconducting material. As best shown in the plan view the resistance conductor comprising a wire strand 2 is aixed to the body sheet by stitching said conductor to the same in the form of open parallel loops A, whereby7 the conductor strand is quilted back and forth an indefinite number of times to provide the necessary length of resistance. The loose ends 2 of the continuous eonductor are connected to feed wires 3, 3', in anv suitable manner, whereby the electric cil:- cuit through the pad is effected.

As best shown in Fig. 2 of the exemplification of my invention, the resistance strand 2 is fed from a needle in a stitching operation and is interlocked by a shuttle thread 4, which shuttle thread may be cotton, silk or other suitable material, or both threads may be metallic forming non-resistance conductors.

It is also within the scope of my invention to insulate the Vmetallic wire strands by covering the same with a suitable jacket material.

It should be distinctly understood that, while I have shown a form of stitch, whereby the conductor 'strand is sewed to the body sheet, I may, without departing from the spirit of my invention, vary the form of stitch indefinitely, the essential element being that the said resistance strand forms a sewing element in itself and, by employing the strand as a sewing element, it is obvious that the pad can be cheaply manufactured with great speed and when completed, its utility and lasting qualities are proportionately greater, due to the 'fact that in stitching the ystrand a greater number of feet of resistance conductor in a given length is obtained than in such heating-pads wherein the conductor is laid thereon and secured in any ordinary manner.

In order to complete the pad after the stitching has been elected, the body sheet 1 has fitted to its opposite faces sheets of material 5 that are impervious to moisture and may be composed of oiled silk or other suitable fabric. This jacket facing is of approximately the same size as the pad and the edges of the jacket material are stitched to the corresponding edges of the body sheet, whereby the resistance conductor is protected. In order to finish the pad, it is preferable to cement or otherwise secure to the outer surfaces of the jacket sheets some soft material 6, such as canton flannel or analogous downy substance, whereby the pad when placed in direct contact with the body will relieve harshness.

It is also manifest that I may, Without departing from the spirit of my invention, sew the resistance conductor to the body sheet in any desired arrangement other than that illustrated as, for example, should. the body strand be provided With an insulatedy jacket it might be quilted back and forth in any design to accomplish the same result.

I claim:

1. An electric heating-pad comprising a flexible body sheet of non-conducting material, a Wire resistance conductor constituting a sewing element in itselfvin stitched union With the body sheet, Waterproof jacket sheets aflixed over the opposite faces ofthe body sheet to conceal and protect the resistance conductor, the said Waterproof jacket sheets being stitched together through the edges of the body sheet, and terminal Wires connecting the ends of the wire resistance conductor, the same being extended beyond the jacket.

2. An electric heating-pad comprising a flexible body sheet of non-conducting Inaterial, a resistance conductor Wire constituting a sewing element in itself in stitched union With the body sheet having end terminals projecting therefrom, a jacket of waterproof material fitted over the body sheet, feed Wires connected to the end terminals of the resistance conductor, and means for securing folds of the pad over the coupling connections between the resistance conductor and feed Wires.

In testimony that I claim the foregoing I have hereunto set my hand at Milwaukee in the county of Milwaukee and State of Visconsin in the presence of two Witnesses.

HARVEY E. BLOOll/IER.`

Witnesses:

Grao. W. YOUNG, M. E. DOWNEY. 

